I bought a beautiful evening dress at an absolutely fantastic price a couple of days ago. It's arrived today but unfortunately it is too big on the waist / bust so I've booked an appointment with what looks like a very well reviewed tailoring service (central London) to have it taken in. I'm wondering if anyone might be able to tell me roughly what I should expect to pay?
To be clear I will pay it since this dress was an absolute steal and I know it will vary, I just want to be prepared so I don't look too shocked in the shop 
It's a full length sequin dress which is lined. I anticipate the sequins will complicate things and make it more expensive!